Not sure where to post it, but UE4 is crashing with Rift (VR preview) even with very simple projects. I've posted about it on UE AnswerHub including a very basic project that crashes 100% on both of our PCs running 1.16 runtime, but runs flawlessly on 1.15, and because of that i would suspect it's more like Oculus Runtime and also posting it here.
Original bugreport: https://answers.unrealengine.com/questions/667905/vr-simple-project-crash.html
Oculus runtime: 18.104.22.1683043
Unreal Engine: 4.16.0 / 4.16.1 (Launcher builds)